Muscles of Mastication

Question 1

Temporal m. Proximal attachment

Answer 1

Floor of temporal fossa and deep surface of temporal fascia

Question 2

Temporal m. Distal attachment

Answer 2

Tip and medial surface of coronoid process and anterior border of ramus of mandible

Question 3

Temporal m. Action

Answer 3

Elevates mandible; posterior fibers are primary retractors of mandible

Question 4

Masseter m. Proximal attachment

Answer 4

Inferior border and medial surface of maxillary process of zygomatic bone and the zygomatic arch

Question 5

Masseter m. Distal attachment

Answer 5

Angle and lateral surface of ramus of mandible

Question 6

Masseter m. Action

Answer 6

Elevates mandible; limited contribution to protrusion of mandible

Question 7

Lateral pterygoid m. Proximal attachment

Answer 7

(1) Infratemporal surface ad crest of greater wing of sphenoid (2) Lateral surface of lateral pterygoid plate

Question 8

Lateral pterygoid m. Distal attachment

Answer 8

Upper head: Joint capsule and articular disc of TMJ; Inferior head: Pterygoid fovea on anteromedial aspect of neck of condyloid process of mandible

Question 9

Lateral pterygoid m. Action

Answer 9

Bilaterally- Protracts mandible and depresses chin;

Unilaterally- Swings jaw toward contralateral side or larger lateral chewing movements

Question 10

Medial pterygoid m. Proximal attachment

Answer 10

(1) Medial surface of lateral pterygoid plate and pyramidal process of palatine bone (2) tuberosity of maxilla

Question 11

Medial pterygoid m. Distal attachment

Answer 11

Medial surface of ramus of mandible, inferior to mandibular foramen

Question 12

Medial pterygoid m. Action

Answer 12

Synergistic with masseter to elevate mandible; contributes to protrusion